Paper-cutting mechanism.



No. 837,683 PATENTED DEC. 4, 1906.

C. W, HOBBS. PAPER CUTTING MECHANISM.

APPLICATION FILED JAN 0 1901 "ll noxnu rum ca. lllltllnurull, bc.

UNITED STATES PATENT. OFFICE.

CLARENCE W. HOBBS, OF W'OROESTER, MASSACHUSETTS.

PAPER-CUTTING M ECHAN ISM.-

Specification of Letters Patent.

Patented Dec. 4, 1906.

Application filed January 8, 1901. Serial No. 42,465.

To all whom it may concern:

Be it known that I, CLARENCE W. Home, a citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Paper-Cutting Mechanism, of which the following isa specification accompanied by drawings, forming a part of the same, in which Figure 1 is a perspective view of the papercutting mechanism. Fig. 2 is a vertical sectional view through the shear-blades. Figs. 3 and 4 are detached views of portions of the operating mechanism.

Similar reference-figures refer to similar parts in the different views.

My present invention relates to a cutting mechanism for severing a continuuos strip of paper at regular intervals, and it is especially designed to be used in connection with a covering-machinefor covering paper boxes for the purpose of severing the covering-strip in appropriate lengths to be wound upon the outside of the paper box while it is held upon a rotating box-form; and my invention consists in the construction and arrangement of parts, as hereinafter described, and set forth in the annexed claims.

Referring to the accompanying drawings, a rectangular arm 9 extends from the forward end of the framework, (not shown,) upon which arm are supported bearings for a rotating box-form (not shown) and the cutting mechanism which forms the subject of my present invention. The cutting mechanism comprises a pair of vibrating shearblades 11 and 12, carried upon rocking frames 13 and 14, which are actuated at the proper period to swing the shear-blades past each other and sever the paper, thereby cutting off from the continuous coveringstrip which passes through the shear-blades 11 and 12 a piece of the proper length to cover the box on the rotating form. The

rocking frames 13 and 14, carrying the shear-.

blades 1 1 and 12, with their actuating mechanism, are shown in an enlarged perspective view in Fig. 1 of the drawings. The shearblades 11 and 12 and their actuating mechanism are mounted upon a block 15, which is capable of sliding upon the rectangular bar 9 and is adjustably attached thereto by a clamping-screw, (not shown,) provided with a hand-wheel 16, by which the cutting mechanism is fixed at the proper relative distance from the rotating box-form to accommodate boxes of different sizes.

The block 15 supports a vertically-adjustable bar 17, capable of being raised and lowered in ways in the block 15 by means of an adjusting-screw 18, journaled in a bracket 19, which projects from the vertically-adjustable bar 17 and engages a nut 20, held in an arm 21, supported by the adjustable block 15, thereby enabling the verticallyadjustable bar 17 to be raised or lowered in order to vary the height of the shear-blades. The shear-blade 1 1 is carried upon a swinging frame 13, which is attached to one'end of a sleeve 22, journaled on a bearing 23,

mounted upon the upper end of the adjustable bar 17. The opposite end of the sleeve 22 carries a segmental beveled pinion 24. The shear-blade 12 is carried by a frame 14, which is attached to one end of a shaft 25, journaled in the sleeve 22 and in a bearing 26, mounted upon the outer end of an arm 27, which projects from the vertically-adjustable bar 17. The shaft 25 carries a segmental beveled pinion 28, and the beveled pinions 24 and 28 engage diametrically opposite sides of a beveled gear 29, which is at taohed to the upper end of a vertical shaft 30, journaled in the arm 27 and in a fixed bracket 31, supported by the adjustable block 15. The outer ends of the rocking frames 13 and 14 have a pivotal connection with each'other by means of a stud 32, carried by the frame 14 and j ournaled in a bearing 33, carried by the frame 13, with its axis in alinement with the axis of the shaft 25.

Inclosing the shaft 30 and held from longitudinal movement by the fixed arms 2]. and 27 is a lever 34, having a spline connection with the shaft 30 and provided with a projecting lug and a three-armed lever 36, capable of turning on the shaft 30 and having its lon er arm 37 connected by a spiral spring 38 with a fixed arm 39 and also by a spiral spring 40 with the end of the lever 34. The three-armed lever 36 has an arm 41 with its end bearing against the lug 35 on the lever 34, and it also has an arm 42, carrying a camroll 43, which bears against the side of a cam 44, carried upon and having a spline connection with a horizontal shaft 45. The camroll 43 is held against the side 46 of the cam 44 by the tension of the spiral spring 38, and the lug 35 upon the lever 34 is held against the end of the arm 41 by the tension of the.

spiral spring 40. The cam 44 is provided f with a notch 47, into which the cam-roll 43' enters as the camis rotated by the shaft 45, allowing the tension on the spiral spring 38 to swing the three-armed lever in the direction of the arrow 48, Fig. 1, and by the pressure of the arm 41 against the lug to move the lever 34 and rock the vertical shaft 30 and .its attached beveled gear 29, thereby imparting a rocking motion through the beveled pinions 24 and 28 to the frames 13 and 14 in order to close them and carry the shearblades 11 and 12 past each other and sever a strip of paper between them. The continuous rotation of the cam 44 in the direction ofthe arrow 49 causes the cam-surface 50 to act against the cam-roll 43 and reverse the rocking lever 36, expanding the spring 38. The tension of the spring holds the lug 35 in contact with the arm 41 as its motion is reversed, imparting a rocking motion to the vertical shaft 30 in the direction to open the rocking frames 13 and 14 and separatethe shear-blades 11 and 12. The

' horizontal shaft is driven by an appropriate geared connection (not shown) with a spindle carrying the rotating box-form, so that the rotation of the box-form will be synchronous with the rotation of the cam 44. The box-form and the horizontal shaft 45 are normally at rest, and motion is imparted to them at will by means of a clutch connection with the driving power. (Not shown.) I have not herein described the clutch connection or method of applying power to the box form, as these features are embodied in machines in common use, and they will be well understood by those conversant with paperbox covering machines. Projecting upwardly from the rocking frame 13 is a handle 53, which allows the rocking frames 13 and 14 to be closed by hand independently of the rotation of the cam 44. When the frames 13 and 14 are closed by hand, the rocking motion of the horizontal shaft 25 carries the lever 34 away from the arm 41, thereby expanding the spring 40, as the arm 37 of the three-armed lever is held from movement by the contact of the cam-roll 43 against the side of the cam 44.

The operation of my improved cutting mechanism when employed in connection with a box-covering machine is as follows: The end of the gummed paper strip is at tached to the side of a box carried upon the form, and the horizontal shaft 45 is connected with the driving power, thereby causing the box-form to revolve and the cam 44 to be rotated in the direction of the arrow 49. The complete rotation of the box-form Winds the ummed paper strip around the outside of t e box and brings the notch 47 of the cam 44 opposite the cam-roll 43, which releases the three-armed lever and allows it to be rocked on the vertical shaft 30 in the direction of the arrow 48 by means of the spiral spring 38. The rocking motion of the three-armed lever 36 by its contact with the lug 35 swings the lever 34, which by its spline connection with the shaft 30 rocks the beveled gear 29 and through the beveled pinions 24 and 28 imparts a rocking motion to the shaft 25 and sleeve 22, thereby closing the rocking frames 13 and 14 and severing the strip of paper. The clutch connection between the horizontal shaft 45 and driving power commonly used in machines of this class is adapted when thrown into action to cause the shaft 45 to make a complete revolution and automatically disengage itself, thereby causing the box-form to stop in proper position to complete the winding of the covering-strip and to stop the cam just after the motion of the three-armed lever 36 has been reversed.

The shear-blades 11 and 12 are brought together by the joint rocking motion of the frames 13 and 14, causing the strip of paper to be severed in a position midway between the opened position of the blades 11 and 12.

By means of the handle 53 a joint rocking motion can be imparted to the frames 13 and 14 independently of the movement of the cam 44, which permits the paper strip to be severed independently of the rotation of the box-form.

It has been customary inv cutting mechanisms of this class to vibrate a shear-blade past a stationary blade, severing the paper strip on the plane of the stationary blade; but in my improved cutting mechanism I vibrate both of the shear-blades and sever the paper strip at a point midway between the blades, thereby providing a clear space when the blades are opened on both sides-of the plane of the strip for the more convenient manipulation of the covering-strip and allowing the hands to pass between the open blades to draw the strip forward.

What I claim as my invention, and desire to secure by Letters Patent, is 1. In a cutting mechanism, the combination of a block horizontally adjustable, a bar carried by said block and vertically adjustable therein, and a pair of vibrating shearblades supported by said vertically-adjustable bar and connected actuating mechanism for simultaneously vibrating said blades.

2. The combination of a rocking sleeve and a rocking shaft journaled concentrically sleeve and said shaft, shear-blades carried by 1 said frames, an actuating-spring applied to rock said frames in the direction to close the blades, and a rotating cam by Which the action of said spring is controlled, substantially as described.

4. The combination of a vertically-adjustable bar, a bearing mounted on said bar, a sleeve journaled in said bearing, a shaft concentric With said sleeve, vibrating frames carried by said sleeve and said shaft, shearblades carried by said frames, pinions carried by said sleeve and said shaft, a gear engaging said pinions, a shaft carrying said gear, a lever attached to said shaft, a pivoted three-armed lever having one of its arms bearing against said shaft-lever, a spring applied to said three-armed lever to rock said shaft, a cam-roll carried by said three-armed I lever, and a rotating notched cam by which the movement of said three-armed lever is controlled, substantially as described.

5. In a cutting mechanism, the combination of a pair of shear-blades, a pair of pivoted frames supporting said blades and having common axes of vibration, a verticallyadjustable bar provided with concentric bearings for said vibrating frames, a block horizontally adjustable carrying said vertically-adjustable bar, means for raising and lowering said bar, and means for actuating said frames.

' Dated this 3d day of January, 1901.

CLARENCE W. HOBBS.

Witnesses:

Burns B. FOWLER, FLoRnNoE- C. 000K. 

